Based on toxicology studies, benzimidazoles such as Fenbendazole, Mebendazole or Albendazole seem to be safe drugs.
However, a drug without any side-effects does not exist. Scientific data reports do not reveal significant adverse reactions from taking fenbendazole. Despite the fact, there are anecdotal reports of potential toxicity:
- Up to 5 % of people can experience stomach discomfort or diarrhea when taking large quantities of fenbendazole with no breaks.
- People with severe liver or kidney failure have lower medication excretion rates, therefore, fenbendazole can accumulate and cause unexpected side-effects. Doses should be divided accordingly in this situation.
- When used in large quantities for a long period of time without breaks, fenbendazole can cause an asymptomatic liver enzyme increase due to the fact of the substance being mainly metabolized in the liver. This is reversible with the help of a couple week pause from the medication.
The protocol was designed to keep the liver in optimal health, therefore the schedule of weekly 3 days on, 4 days off was previously suggested. However, more and more people are using fenbendazole on a daily basis without problems.
We would still recommend taking at least 1 day off per week to avoid overstressing the liver if the medication is to be used for prolonged periods of time (like months or years).
To keep the liver health optimal, we advise you to take 250 mg capsules of Milk Thistle or 150 mg of Silymarin daily as a supportive supplement for keeping it in great shape.
References
Lacey, E. (1979). Mode of action of benzimidazoles
Blanchard, P., & Villard, J. (2008). Toxicological profile of benzimidazole derivatives: Fenbendazole and mebendazole
Morris, G. M., & Keppler, D. (2019). The role of anthelmintic drugs in the treatment of cancer
Lacey, E., & Morrell, A. (2013). Benzimidazoles in cancer therapy: repurposing anthelmintics for oncology
I would like to know if anyone has had any trouble taking FenBen when they do not have a gallbladder.
ChatGPT suggested that it would not be a great idea since it would cause liver enzymes to increase and problems due to reduced bile production.
Hello, Sally, and thank you for a great question.
Fenbendazole does not rely on the gallbladder itself, but on the liver’s ability to produce bile. Even without a gallbladder, bile is still made by the liver and released continuously into the intestine, just not stored. Because of that, most people without a gallbladder tolerate fenbendazole just fine, especially when it is taken with food that contains some fat.
It’s true that fenbendazole is processed by the liver, and temporary liver enzyme elevations can happen in some people, but this is not specific to people without a gallbladder. In real-world use, issues are far more likely when doses are pushed too fast or when liver support is neglected. This is why many choose to go slowly and include basic liver support such as milk thistle or TUDCA, which also helps bile flow.
Does fenbendazole affect gut bacteria? I have not heard of any need in taking probiotics after using it. Would you recommend doing this?
Fenbendazole is not an antibiotic, so it does not directly target bacteria. Current evidence and user experience indicate it has minimal disruptive impact on gut bacterial populations, which is why probiotics are not routinely required after fenbendazole use.
That said, supporting the microbiome is always reasonable when someone wants to optimize overall resilience. If you choose to include probiotics, it should be viewed as a general wellness measure, not a recovery necessity.
Hello. My recommended dosages was 444 for 5 days , my question is if I have 500 mg tablets, am I okay to take that for 5 days even though my recommended dose was lower? Will it cause any issues being that it’s a higher dose? And my husband that is diabetic will this cause him any issues being a diabetic? ( this is for parasite cleanse)
I plan on taking milk thistle for liver detox and charcoal for the binder.
Hello Monica,
Taking a 500 mg tablet instead of 444 mg for a short 5-day cleanse is generally considered acceptable, and most people tolerate this small increase without any issues. Fenbendazole has a wide safety margin, so the difference between 444 mg and 500 mg is not significant.
For your husband, being diabetic does not typically create problems with fenbendazole during a short parasite cleanse. It does not affect blood sugar levels, and most diabetics use it without complications. As with any supplement, it is important to monitor how he feels, but no specific risks are known.
Milk thistle for liver support and charcoal as a binder are both commonly used and are fine to include.
Overall, everything you described sounds appropriate and should be well tolerated.
Hi Fenben,
I have relative with a bone marrow disease (myelofibrosis – scarring of the bone marrow). He’s been anemic, but is off transfusions due to Fenbendazole, curcumin, tocotrienols, zinc/quercetin, Turkey Tail mushrooom, and Vitamin D3/K2. He takes everything about 3-4 days per week. Should he take the curcumin every day. He can’t tolerate ivermection. It makes him too “wobbly” and unsteady on his feet. Would appreciate any comments. Thanks.
Dear Tom,
Curcumin is generally safe to take daily, and for conditions driven by chronic inflammation, consistent use may offer better benefit than taking it only a few days a week, as long as it is well tolerated and taken with some fat or black pepper for absorption. Since he cannot tolerate ivermectin, keeping the other anti-inflammatory and immune-supportive supplements steady can still help maintain stability.
If the current protocol is keeping him off transfusions and his energy stable, it may be worth continuing as is but making curcumin a daily habit, since its effects tend to build over time rather than work intermittently. Has he noticed any difference in symptoms or lab results on the days he takes curcumin compared to when he does not?
Good afternoon,
First of all, thank you for this light you shed on those of us who, in my case, grieve for our loved ones.
My mother has stage IV metastasis in her digestive system that has spread to the liver, and I’m doing everything I can to try to prolong her life. Right now, she’s had to undergo bypass surgery to open her stomach, since her cancer, which originates there, had closed it. She’s already adapted and eating, but we haven’t started any treatment yet, as her physical condition is not at the level to support quimio or radio yet. She weighs approximately 45 kg and is 1.60 m tall.
I’ve been researching the use of fenbendazole for cancer treatment for several days now, and after the positive results, I’d like to start giving her fenbendazole, but I need help with indications, please.
Thank you very much for your advice in advance, and best regards!
Hello, Carmen. Thank you for your message. We deeply respect the care you are providing your mother.
For her weight (45 kg), a standard fenbendazole dose would be 222 mg per day. Start with 3 days on, 4 days off to assess tolerance. If well tolerated, you may shift to 5 days on, 2 off. Ensure she takes it with food and consider adding TUDCA or milk thistle to support the liver.
Given her current weakness, go slowly. Watch for any side effects, especially digestive or liver-related, and adjust accordingly. Wishing your mother strength and stability in this critical time.
Huge thank you for all you are doing for us!!! I willl carefully follow and monitor the indications. THANK YOU!!!
Hi! Do you know if prolonged Fenbendazole can cause low iron levels or destroy red blood cells.
Hello Ingrid,
Currently, there is no strong scientific evidence showing that prolonged use of Fenbendazole causes low iron levels or destroys red blood cells in humans or animals. Fenbendazole is generally considered well-tolerated, even with extended use, especially at moderate doses. However, every individual can respond differently. If someone is experiencing symptoms like fatigue, pale skin, or other signs of anemia while using Fenbendazole, it is important to monitor bloodwork—including hemoglobin, hematocrit, and iron levels—to rule out other causes or rare reactions. If you are concerned, tracking complete blood counts (CBC) and iron panels during long-term use is a good precautionary step.
Hi ,my partner is starting on fenbendazole 222mg capsules.He as some metastasis on his liver and kidney.In October he had colon surgery .The oncologist didn’t give him a good prognosis and said he needed to start chemo.My partner refused chemo and they wernt to pleased.
How many days on and off would you recommend?He is on ivermectin. Im also giving him milkthistle, dandelion root and blackseed oil.I would be Greatfull if you could help me out.Thankyou
Hello, Linda and thank you for reaching out.
most commonly followed pattern is a cyclical approach, not continuous daily use. Many people follow a pattern of 5–6 days on and 1–2 days off, or 4 days on and 3 days off, particularly if there is liver involvement. The off days are important to give the body, particularly the liver, time to recover and adapt.
A dose of 222 mg per day is generally considered a conservative starting point. With liver and kidney metastases, most people prefer to start gently rather than push dosing, then adjust only if tolerance is good. Since he is also using ivermectin, spacing doses and watching for fatigue, appetite changes, or liver-related symptoms is important.
The supplements you mentioned, milk thistle, dandelion root, and black seed oil, are commonly used alongside fenbendazole for liver and metabolic support and are generally considered appropriate in this context.
Hello, I know someone that will start treatment for glioblastoma. Is there any interaction with Keppra, of TMZ, or blood pressure medication that is known?
Dear Anne,
Fenbendazole does not have any known interactions with Keppra (Levetiracetam), Temozolomide (TMZ), or blood pressure medications. It is generally well tolerated and does not interfere with the mechanisms of these treatments. However, as with any additional supplement, it is always best to monitor for any unexpected effects when introducing it alongside ongoing therapies.
Question,
what would be a good dose for a cancer in remission ? I noticed after taking 2000mg a day as advised by a friend taking it that my WBC’s, platelets went down substantially and my HST is elevated.
Will this repair on its own with a few day rest/pause and decrease to 500mg daily?
Hello, Brandi.
We would recommend for you not to forget liver supplements; they play a big role in a regeneration after taking prolonged and increased dosage. Also for remission, we recommend 222-444 mg dosage depending on your weight. Be sure to check our dosage calculator: https://www.fenbendazole.org/fenbendazole-information/fenbendazole-dosage-guide/
Hi there. Thank you for your responses to people’s questions! They are very helpful.
My dad was diagnosed with early stage large B Cell Lymphoma and they are going to start chemo after his kidney infection is resolved, and kidney stone is removed. Considering this info about the kidneys, what dosage (I’m assuming 444mg) and how spaced out can we administer Fenben safely? And will this damage his kidneys further? Thanks in advance.
Hello, Fernando. Thank you for a question.
Fenbendazole’s effects on the kidneys have not been extensively studied in humans or pets. There is no strong evidence to suggest that fenbendazole causes direct harm to the kidneys when used correctly. Prolonged or excessive use could potentially put a bit of stress on the kidneys, especially if the liver function is also compromised. The main side effect is a bigger stress on kidneys; that is why we suggest using supplements for the liver like Milk Thistle (Silymarin), Turmeric (Curcumin), or Alpha-Lipoic Acid (ALA). The dosage must be determined using dosage calculator according to weight, which you can find on our page also: https://www.fenbendazole.org/fenbendazole-information/fenbendazole-dosage-guide/
I keep reading so many say you need more than what is recommended on here. Also. Some say it will hurt white cell count etc and the liver. Who do you listen to?
I dont want to kill my liver or blood counts but want it to benefit with amt taken :(. There’s so much info
Hi, I have an 80lb dog with hemangiosarcoma. She is currently on tramadol and carprofen. Are there any interactions with these meds and fenbendazole? Also, I was told 444mg daily for 4 days then off for 3 days, then continue the protocol. Does that seem right to you? Thank you so much.
Hello Patti,
There are no known interactions between fenbendazole and the medications tramadol and carprofen, so it should generally be safe to use them together. However, as always, it is important to monitor your dog for any changes in behavior, appetite, or overall health while on these treatments.
The dosage and schedule you mentioned—444mg daily for 4 days, followed by 3 days off, and then continuing the protocol—is correct for an 80lb dog. This schedule is commonly used and helps balance effectiveness with minimizing any potential strain on the liver or digestive system.
It is a good idea to monitor liver enzymes periodically, especially if your dog is on multiple medications, to ensure everything remains well-tolerated. Wishing you and your dog the best during this time.
Hi! My 13.5-pound pomeranian was just diagnosed with Lymphoma. I want to start her on Fenben but I don’t know what dosage to give her. also, the Vet wants to do chemo, so I’m wondering if there would be a contraindication with Chemo and Fenben?
Hello Christina,
For a 13.5-pound dog, the recommended dose of fenbendazole is 222mg. The suggested protocol is to give 1 capsule three days a week, once a day after a fatty meal, such as butter or coconut oil. After three days of dosing, take a four-day break with no fenbendazole, then repeat this cycle weekly.
Regarding chemotherapy, there are generally no known contraindications between fenbendazole and chemotherapy. However, it is advisable not to administer fenbendazole two days before chemotherapy, on the day of chemotherapy, and for two days after the treatment. This precaution helps avoid any potential interactions and allows the body to recover from the chemotherapy.
For accuracy and convenience, you can use this dosage calculator: https://www.fenbendazole.org/fenbendazole-information/fenbendazole-dosage-guide/. Wishing you and your dog the best during this challenging time.
I’ve started feeling queasy after taking it for a few months so have stopped. Still feeling queasy. Had the chills one minute then sweating (flu like) but not ill.
Hello Tracy,
It sounds like your symptoms could be related to your body’s response to the medication or an unrelated issue. Feeling queasy, experiencing chills, and sweating could indicate detox-like effects, mild side effects, or even a completely unrelated condition.
Stopping the medication was a good precaution. If the symptoms persist, it is essential to consult a healthcare provider to rule out any underlying issues. In the meantime, you can monitor your symptoms, stay hydrated, and ensure proper nutrition to support your body. If you decide to restart the medication later, consider doing so at a lower dose to observe your tolerance and reduce potential side effects.
Hi I have my dad on fenbendazole for cancer (prostate, bone, lung, just about everywhere) for a couple weeks now. He has strong itching on his arms now. Has this ever happened as a side effect? I have him on approx. 500mg daily (I accidentally bought powder instead of pills and have to cut 2000mg packets into 8 divisions)
Hello, Toni, thank you for your question.h
Generally fenbendazole side effects are :mild gastrointestinal discomfort (nausea, diarrhea, or abdominal pain).Light headache or dizziness. ,liver enzyme elevation (rare, typically reversible). Allergic reactions is also possible but very rare (this would result in a rash, itching, or swelling).
Hi, are there any contraindications with Fenbendazole? My wife is taking a number of natural supplements and tonics, in addition to a blood thinner twice a day (Eliquis), and two pain killers twice / once a day (Gabapentin, Dilaudid). Would there be any known concerns? Thanks
Hello Kevin,
Thank you for your question. Fenbendazole is generally considered safe and well-tolerated; however, it is important to note that research on its use alongside certain medications, such as blood thinners (e.g., Eliquis) and painkillers like Gabapentin and Dilaudid, is limited. While there are no widely reported contraindications between fenbendazole and these medications, combining treatments should always be approached with caution.
Fenbendazole may interact indirectly by influencing how the liver metabolizes substances, as it undergoes processing in the liver. This could theoretically affect the way other medications are metabolized, including blood thinners and pain medications, which rely on precise dosing for safety and efficacy. Additionally, given the complexity of your wife’s current regimen, careful monitoring of her overall well-being and blood parameters is crucial when introducing fenbendazole.
It is also important to take fenbendazole with food to enhance its absorption and reduce the risk of gastrointestinal side effects. If you choose to proceed, starting with a low dose, such as 222mg taken 3–4 days a week, may help minimize any potential risks. Gradually increasing the frequency if it is well-tolerated could provide a safer approach. Close attention to her response to the treatment, including any changes in her symptoms or side effects, will be essential.
We recommend proceeding cautiously and keeping track of her condition throughout the process. We wish you and your wife strength and positive progress on this journey.
Hello, I still feel parasites crawling on my skin at night. I am on day 6 of fenben. I dont want to stop when the parasites are still active, what should I do?
Hello, Erik, thank you for a question.
If you still feel parasites in your body, you may do a day pause for your organism to take a little rest and continue a second 6 day cycle. If this does not work you should go to a medical care professionals and consult with them, maybe they will prescribe something that could resolve your health issue.
Can you mix 222mg of fenbendazole with water and drink it as a solution rather than taking it in capsule form.
Dear Jim,
Yes, you can mix 222 mg of fenbendazole with water and drink it as a solution instead of taking it in capsule form. Fenbendazole is not water-soluble, so it may not fully dissolve in water, but you can still mix it and consume it that way. Just make sure to stir it well before drinking. It is often recommended to take fenbendazole with food to improve absorption, as fat can help with its bioavailability. You may want to consider taking it with a meal or mixing it with something like a fatty snack for better effectiveness.
My husband has cancer in lymph nodes in his neck and has stage 3 kidney failure. He is wanting to take this product
Hello Glenda,
It is possible for him to begin the protocol, but due to his stage 3 kidney failure, it is crucial to approach this cautiously. He should not exceed a daily dose of 444 mg of fenbendazole. The liver and kidneys play an essential role in metabolizing this compound, so monitoring kidney and liver enzyme levels is especially important, given his compromised kidney function.
Regular blood tests to track his kidney and liver health should be part of the plan, as they will help ensure that his body is handling the treatment well.
Hi I’m in the UK and exploring all options . Always been fit and healthy .
Never really Ill except for a Flat battery from doing too much . Nearly 80 But everyone throughout my life has thought me much younger . Ex Gym Member many years However II now find I have Prostate Cancer which has spread into Lymph Nodes and Bones — Gleason Scale shows (R 9 (4+5) (L (4+5) Stage T4a N2 M1B – Chemo and Radiation I believe is going to be proposed on my next Hospital visits 3rd Week September.
Looking at Alternatives OR to support : ie Fenbenazole / Ivermectin .and other support products
Any advice would be most welcome Thank you
Hello Keith,
Thank you for reaching out. We understand that exploring all available options is important, especially when faced with a challenging diagnosis like prostate cancer that has spread to the lymph nodes and bones. We specialize in providing information about fenbendazole, a drug that has shown promise in the treatment of various cancers, including prostate cancer.
Given its potential effectiveness, it may be worth considering adding fenbendazole to your treatment protocol. To help determine the appropriate dosage and usage schedule for your specific case, we recommend using our dosage calculator: https://www.fenbendazole.org/fenbendazole-information/fenbendazole-dosage-guide/. This tool will guide you in finding the correct dose based on your individual circumstances.
Additionally, at the bottom of the calculator page, you will find suggestions for supplements that can be added to your routine to support your overall health and treatment plan.
Is it possible that taking fenbendazole could cause blood in one’s urine?
Dear Suzan,
Fenbendazole does not typically cause side effects such as blood in the urine (hematuria), but it is important to be aware of any unexpected symptoms. Blood in the urine can occur for various reasons, including urinary tract infections, kidney stones, or more serious conditions such as bladder or kidney problems. If you or someone you know develops blood in the urine while taking fenbendazole, it is important to stop taking the medication and consult a healthcare professional immediately to determine the cause and ensure appropriate treatment.
Hi there
A friend recently mentioned his daughter taking fenben for endometriosis and seems to help her. I am 47, it took decades to be diagnosed after multiple mis-diagnosis and I have had two surgeries so far…hoping this may be an alternative to more surgeries. I was wanting to know if there is a specific protocol to follow for endometriosis and would this same protocol assist with parasitic infection? Has there been much research done in regards to Endo and Fenben? Thank you
Hello Jen,
Unfortunately, we do not have any data on Fenbendazole’s effectiveness for conditions like endometriosis. However, if you choose to try Fenbendazole for endometriosis, you can use our dosage calculator to select a protocol intended for parasite treatment. You can find the dose calculator here: https://www.fenbendazole.org/fenbendazole-information/fenbendazole-dosage-guide/
Hello – just finished five radation treatments via CyberKnife for prostate cancer. Wanting to start the JT protocol. Im taking a testostetrone blocker med called Orgovyx. Do you see a conflict with this med? Also, Ive choosen the safe-guard equine fenben paste. ANy thoughts on this and not sure how the syringe for portions works? Thanks in advance and for all the great info!!
Dear Mike,
Orgovyx is a drug that operates through hormonal pathways, which are entirely different from how fenbendazole works. There are no known interactions between Orgovyx and fenbendazole, but since both are metabolized by the liver, there could be concerns about liver function when used together. Monitoring liver function through enzyme tests is crucial.
Regarding the Safe-Guard equine fenbendazole paste, the syringe is typically marked with increments based on a horse’s weight (in pounds). You will need to calculate the correct dose for your body weight. For example, if you need 222 mg of fenbendazole, you will have to adjust the syringe accordingly. Accurate dosing is essential to avoid overdose.
To make things easier, we recommend using our dose calculator, which can help determine the correct fenbendazole dose for you. You can find the calculator here: https://www.fenbendazole.org/fenbendazole-information/fenbendazole-dosage-guide/
My dad has stage 4 non small cell lung cancer. Over the past two months, he’s been taking Fenbendazole 444mg twice per day along with curcumin 650mg and milk thistle 250mg. He also takes DCA 500mg three times per day with Benfotiamine 100mg, alpha lipoic acid 300mg & acetylene l-carnitine 750mg. Then he takes Artemisinin Annua 2 capsules, and 120mg of Ivermectin horse paste.
For the past 2 months his 10cm sq mass was stable then as of Aug 8, an x-ray revealed it had shrunk by 1cm. However, my dad’s WBC is .001 and he’s been hospitalized.
The doctors say he looks great, they cannot find an infection anywhere & they think he has pneumonia. They want him to stop all the treatments he is taking as they believe Fenbendazole is lowering his WBC. Does it lower WBC?
My dad does not want to stop taking his home treatments for 3 months because his oncologist wants him to do chemo when his WBC returns to normal (he had 5 days of radiation at the end of June). From what I understand, Fenbendazole works well with chemo & DCA.
Can you offer suggestions/advice?
Thank you in advance.
Dear Jade,
The effects of fenbendazole on white blood cell (WBC) counts in humans are not well-documented, and no strong clinical evidence directly links fenbendazole to reduced leukocyte counts. However, there is a small chance that your father’s WBC drop could be related to his use of fenbendazole.
A WBC count of 0.001 (or 1,000/mm³) is extremely low and puts your father at high risk of infection. Even without a detected infection, his severely compromised immune system is a serious concern. The doctor’s recommendation to pause all treatments likely aims to determine the cause of the low WBC and prevent further decline.
While fenbendazole and DCA may have potential in cancer treatment, combining multiple unconventional therapies with conventional treatments like chemotherapy or radiation increases the risk of adverse effects and drug interactions, including further WBC reduction.
Fenbendazole and DCA may be safe to use alongside chemo, but if the current treatment is effective and the primary issue is WBC reduction, a short treatment break might help his WBC count recover. Once stabilized, he could resume his treatment regimen.
Seeking a second opinion from a specialist experienced in both integrative and conventional cancer treatments could help balance these approaches. Prioritizing WBC stabilization is crucial for his safety. Careful decision-making is essential to ensure a safe and effective treatment plan.
I am very impressed with the questions,and especially your answers,I’ve been fighting melanoma for over 4 years. With keytruda 4 years ago, cancer free until 8 months ago.Now stage 4 metastatic melanoma with a 12 mg nodule in my lung.Am now on my fifth opdivo immunotherapy. Would it be OK to start on fenbendazole treatment.Appreciate your wonderful work it gives a feeling that i have found someone who can answer these tough questions your friend jim p.
Hello Jim,
we greatly appreciate your recognition of our work. Currently, there is limited research on the interaction between fenbendazole and Opdivo (nivolumab) immunotherapy. Given that fenbendazole is an anti-parasitic drug and Opdivo functions as an immune checkpoint inhibitor, the lack of specific studies makes it challenging to predict how your body might respond to this combination. While fenbendazole is generally considered a well-tolerated and safe medication, we recommend discontinuing its use 2 days prior to, on the day of, and 2 days following your immunotherapy infusion. Additionally, it is important to monitor your overall well-being and regularly check your liver enzyme levels.
Is it safe to use fenben at the same time as anti-seizure medications?
Hello Bonnie,
Fenbendazole is generally considered a safe and well-tolerated drug, and its interactions with other medications are not well-documented. Therefore, we cannot provide a definitive answer to whether it is safe to use fenbendazole alongside anti-seizure medications, as individual reactions can vary. Each person’s body can respond differently to drug combinations. If you decide to use fenbendazole alongside anticonvulsants, start with lower doses and closely monitor how you feel. It is also a good idea to take the medications at the longest possible intervals apart.
Hello,
Does Fenbendazole also help to cure flu like sinusitis? I suffer a flu or cold for 3 months and probably its a virus. I don’t know exactly what is is but it feel like a have the flu but without the fever and desperate to get better again.
Thanks!!
Hello, Ron.
The theoretical use of fenbendazole for conditions like flu or sinusitis is not supported by current scientific understanding or evidence. Fenbendazole is designed to target parasitic infections through specific mechanisms that disrupt the biology of parasites. It does not have known antiviral or antibacterial properties that would make it effective against the pathogens typically responsible for flu or sinusitis.
Can you take it with alkaline water?
Hello Brianne,
Yes, you can take fenbendazole with alkaline water. There are no known interactions between fenbendazole and alkaline water that would affect the efficacy of the medication.
is fenbendazole effective for chronic lymphocytic leukemia, recently diagnosed and in wait and watch stage.
Hello Nona, thank you for your question.
Yes, especially in early stages, Fenbendazole can help cure chronic lymphocytic leukemia. In your particular situation, Fenbendazole’s efficacy relies on a number of elements. These include your leukemia’s particular genetic composition and degree of advancement as well as your body’s reaction to the medicine.
Fenbendazole mechanism of action involves disrupting microtubule formation in cancer cells, which impairs their ability to take up glucose and ultimately leads to their demise.
My wife takes fenbendazole a few times a week when she first started taking it she had no issues. For some reason now she gets very sick to her stomach is there any thing she should take with the fenben to help with the upset stomach usually she takes with ice cream or yogurt.
Hello Chris,
In rare instances, extended use of Fenbendazole or overdoses can lead to stomach pain or digestive disturbances as a potential side effect. Due to insufficient information about your wife’s specific circumstances, we cannot pinpoint whether this symptom resulted from an incorrect dosage, timing, or an underlying condition.
We suggest practical steps that may alleviate these symptoms. For your wife, consider taking Fenbendazole with fatty foods (not yogurt or ice cream), which can sometimes lessen stomach discomfort by providing a buffering effect and potentially reducing nausea.
Veterinary preparations may contain additives like fragrances or preservatives that could cause gastrointestinal irritation in certain individuals. If your wife is using a veterinary form of Fenbendazole, switching to pure Fenbendazole might be beneficial.
Over-the-counter antacids such as calcium carbonate (Tums), magnesium hydroxide (Maalox), or aluminum hydroxide/magnesium hydroxide (Mylanta) can neutralize stomach acid and relieve indigestion.
Incorporating probiotics into her diet or as supplements can restore beneficial gut bacteria disrupted by Fenbendazole, potentially alleviating stomach upset.
Ensure adequate hydration by encouraging her to drink plenty of water, as it can aid digestion and reduce gastrointestinal discomfort.
For guidance on selecting the correct dosage and schedule, utilize our dosage calculator available at:
https://www.fenbendazole.org/fenbendazole-information/fenbendazole-dosage-guide/
Herx, I think im having major die-off symptoms!!!!
I did 5 days of 222mg it’s been about 3 days since I’ve stopped and i have what feels like the flu. Severe body aches, chills and nausea. I wasn’t prepared with absorbers, so i ordered zeolite and some dead sea salt for bath. I guess in a way it’s probably a good sign, was a little nieve to think it wasn’t going to be that bad. I understand that it’s not the Fenben itself causing these symptoms, but it would be nice to educate people a little more about the possible effects of die-off and Herxhiemer symptoms so that they may be better prepared. I know my Herx is probably worse then your average person cause of other health issues so i can’t say im surprised. At least ill be better prepared for my future rounds! This is no joke though… Xoxo
Dear Chandra,
We are sorry to hear you are experiencing such intense symptoms. What you are describing sounds like a Herxheimer reaction, which can occur when the body is eliminating toxins released by dying cancer cells. These reactions can indeed feel very much like the flu, with body aches, chills, and nausea.
It is good to hear that you have ordered zeolite and Dead Sea salt, as these can help your body manage and detoxify these reactions. Moving forward, it is important to stay well-hydrated and rest as much as possible during these episodes.
While it is a positive sign that the treatment is having an effect, it is crucial to be prepared for these potential reactions in future rounds. Regular monitoring of your symptoms and maintaining open communication about any changes you experience is essential. Please keep in mind that such symptoms are very rare and occur in a small number of patients. Individual responses can vary, especially considering your other health issues. Adjusting your approach based on your body’s signals and ensuring you have supportive measures in place can make a significant difference.
Take care and best wishes for your continued treatment and recovery.
I want to start my dog on Fenbendazole but right now on prednisone . Should I stop Igiving my pup prednisone prior to starting her on fenbendazole? Please help
Dear Cecilia,
There are no known interactions between fenbendazole and prednisone. However, using these medications together requires careful monitoring because they can both affect liver function. It is important to monitor your dog’s liver enzymes and conduct other relevant tests to ensure her health remains stable.
Prednisone should not be stopped suddenly, as abrupt discontinuation can lead to serious complications, including adrenal insufficiency. Gradual tapering under veterinary supervision is necessary to safely discontinue prednisone.
It is crucial to talk to your veterinarian before making any changes to your dog’s medication regimen. If your vet advises against the use of fenbendazole, you may still consider using both medications together, but it must be done very responsibly. Follow the prescribed schedule and dosage closely, and regularly check your dog’s health to ensure she is tolerating the treatment well.
Hello, my dad has stage 4 liver cancer and tumor in colon. Waiting on the biopsy results but wanted to see if this is a good option?
Hello Jennifer,
Fenbendazole is generally well-tolerated and considered safe. It can be used by nearly all cancer patients. However, due to the lack of extensive documentation on how fenbendazole affects human liver metabolism, its use in treating liver cancer should be closely monitored. You might also consider giving your dad supplements like milk thistle, which can help maintain normal liver enzyme levels. It’s important to regularly monitor your dad’s overall health and ensure he gets routine blood tests.
My husband has had 16 blood transfusions in 5 months and still hemaglobin runs 7 to 9. He also has chronic kidney disease stage 4B and will not be doing dialysis (personal choice). He is also IgA defiecient. Considering using panacur c; to see IF would help, what are your thoughts??
Dear Jeanne,
Fenbendazole lacks a recognized mechanism or proven effectiveness for addressing human immunological conditions such as IgA deficiency, and it is not appropriate for treating issues like low hemoglobin or chronic kidney disease (CKD). There is no scientific backing or clinical trial data to support the use of fenbendazole for these health problems.
For someone like your husband, who is managing a severe condition like stage 4B chronic kidney disease, it is essential to follow the recommendations and treatment plans laid out by nephrologists or specialized healthcare professionals. These experts are equipped to provide guidance on established, safe, and effective treatment strategies.
My partner has liver cancer and we are considering her taking 250mg (half a 500mg tablet obtainable in Australia) using your recommended 222 mgs protocol. Her treating doctor has said that she can no longer offer assistance and has recommended palliative care.
Her body weight is 58 Kilos and her age is 82 years. She is taking occasional Panadol and Metoclopramide 10 mg for sickness suppression..
Could I please ask if the above action sounds safe
Thank you..
Hello Roy,
Fenbendazole is generally considered safe and well-tolerated. However, caution is necessary, especially when your partner has liver damage, and when using any off-label drugs. A typical dose of 250mg of Fenbendazole usually does not cause side effects, but vigilance is key due to the lack of extensive studies on its effects in humans.
Given that acetaminophen is metabolized in the liver, and the effects of fenbendazole on human liver metabolism are not well-documented, using these in combination requires careful monitoring. Additionally, you might consider incorporating supplements like milk thistle to help maintain normal liver enzyme levels.
If you decide to continue using this combination, closely monitor for potential side effects, such as gastrointestinal issues from metoclopramide or liver problems from acetaminophen.
In conclusion, while there is no specific evidence of harmful interactions between metoclopramide, acetaminophen, and fenbendazole, the experimental nature of fenbendazole’s use in humans necessitates caution and vigilant monitoring of the patient’s health. Be sure to regularly check liver enzyme levels to manage any emerging issues effectively.
Does fenbendazole interact with Lanreotide (somatuline depot) injections (monthly)?
Dear Ashley,
Thank you for your question. Fenbendazole is generally considered safe and well-tolerated. However, interactions with other medications can occur, and not all of these interactions are known. Unfortunately, we couldn’t find any specific data regarding an interaction between Lanreotide and Fenbendazole. Nevertheless, we recommend that you check your blood tests monthly and closely monitor your overall well-being.
Hello there.
I wish to commence Fenbendazole 444mg per day that I ake it for stage 3 locally advanced pancreatic cancer. Would it be best to take it daily at that dosage with a day off each week or to do the 3 on 4 off protocol please? Thank you
Dear Hujamen,
When selecting the appropriate dose and frequency of Fenbendazole based on your body weight, we recommend using our dose calculator: https://www.fenbendazole.org/fenbendazole-information/fenbendazole-dosage-guide/.
If you consider increasing the frequency or dose, please ensure not to exceed a daily dose of 444mg. Additionally, when adjusting the frequency of use or shortening the intervals between doses, we advise regular blood tests to monitor liver enzymes and keep track of your overall well-being.
Can you take this drug trans-dermally to avoid the digestive system and avoid the liver altogether?
Hello, Larry. Thank you for a question!
While it is theoretically possible to apply it transdermally, the efficacy and safety of such a method are considerably less established and understood.
Bypassing the liver’s first-pass metabolism, transdermal drug delivery may reduce the drug’s exposure to the liver. However, it is crucial to note that its efficacy may be diminished due to variations in fenbendazole absorption by the epidermis. Additionally, the risk of liver toxicity may not be entirely eliminated by transdermal administration, as a portion of the dose may still enter the bloodstream and indirectly impact the liver. Continue to apply it transdermally Therefore, we advise that you continue to use fenbendazole as usual.
My father was just diagnosed with small cell lung Cancer. We also just learned he now has cirrhosis. Just wondering if he would still be able to take fenbendazole?
Hello, Tina!
In such case we would not recommend taking fenbendazole. If you manage to keep liver enzymes relatively low, you may begin fenbendazole protocol, but keep in mind that in this case you should not go higher then 222mg and also pauses should be prolonged. So the effectiveness of fenbendazole in this case is questionable, because if enzymes climb up to 200 U/l we would recommend taking a break from fenben at least for 2 weeks.
In my recent experience, I followed a protocol that recommended taking 4 grams/day of Fenben for 14 days straight. Thats almost 20 times the recommended amount in the Joe Tippens protocol. I have experienced noticeable liver inflammation and have stopped taking Fenben. My liver enzymes numbers from a blood test were 20 times what the normal range should be. My digestive issues are very uncomfortable. I would personally recommend following a schedule of no more than 4 days on and 3 days off and keep the dosage at 222mg/day.
Hello, Jason. Thank you for a comment.
Yes! There are a lot of different protocols that circulate on the internet. We recommend safe dosages, and in our fenbendazole dosage calculator you would never get a value of 4000 mg for 2 weeks straight. That amount is dangerous and harmful. Really glad you are on a different protocol now!
Best Regards!
Does fenbendazole interact with blood thinners like warfarin/coumadin?
Hello, Selinda, thank you for your question.
Fenbendazole does not appear to have any significant reported interactions with blood thinners according to available data from various sources, including detailed drug interaction resources.
Does fenbendazole work well with urine therapy?
Hello, Ann, thank you for a question.
As of now, there are no available reports describing its efficacy in conjunction with urotherapy. The investigation of synergy or dissonance is lacking.
Can pregnant people take this?
Hello, Charlotte.
If you’re thinking about keeping up with Fenbendazole while pregnant, the best step is to chat with a doctor first since there’s no clear info on its safety during pregnancy in the documents we have. Also, keeping an eye on liver health might be a good idea, and maybe even taking it a bit easier with the dosing schedule could be wise. Just to play it safe for both mom and the little one on the way.
FYI: I have been taking IVERMECTIN on and off for the prevention of covid for the past two and a half years – I tolerate it really well.
Once again, thank you so much!
Many blessings!
Hi,
I took one dose of Panacur C, I felt terrable. My blood presure was elevated, loss of energy and I had a minor cramp in my right calf.
I really would like to take Fenbendazole!
After how the majority of doctors responded in a negative manner to COVID-19, I have lost trust in the medical establishment. I cannot find A doctor who understands the benefits of Fenbendazole and alternative medicines.
I would greatly appreciate it if someone has any advice.
Thank you, and many blessings!
Anthony,
Dear Anthony,
Fenbendazole is considered a relatively safe drug. We recommend using our dose calculator, which will guide you on a safe dosage and schedule based on your body weight.
https://www.fenbendazole.org/fenbendazole-information/fenbendazole-dosage-guide/
Begin taking Fenbendazole at half the dose suggested by the calculator. If you feel good after a few weeks, you may adjust the dose to the amount recommended by the calculator. We also advise regularly monitoring your general well-being and checking your liver enzymes.
Does this require a special diet?
Dear Rico,
Fenbendazole does not necessitate a special diet. However, the bioavailability of the drug can be enhanced by the presence of food in the intestine. Food intake slows down intestinal motility and increases blood flow to the digestive tract, which can improve the absorption of the drug. Therefore, it is recommended to take Fenbendazole with or after meals. Specifically, consuming fatty foods while taking Fenbendazole may further increase the absorption of the drug.
How many times per day is suggested for taking 222 MG of fenbendazole?
Hello Rico,
Thank you for your question. Fenbendazole is recommended to be taken once daily, either with or after a meal. This helps to enhance the absorption of the medication.
We recommend using our dose calculator to determine the correct dosage and schedule based on your body weight and treatment goals. You can find all the answers to your questions by clicking on this link:
https://www.fenbendazole.org/fenbendazole-information/fenbendazole-dosage-guide/
I would like to thank you for the efforts you’ve put in writing this website. I am hoping the same high-grade web site post from you in the upcoming also. Actually your creative writing skills has encouraged me to get my own blog now. Actually the blogging is spreading its wings quickly. Your write up is a great example of it.
Excellent read, I just passed this onto a friend who was doing a little research on that. And he just bought me lunch as I found it for him smile Therefore let me rephrase that: Thank you for lunch!
My friend is taking tudca as liver protection and she is doing great with stage four pancreatic cancer. I got my uncle with squeamus cell carcinoma some fenben and tudca to take with it. Will this suffice?
Dear Stormy,
Both TUDCA and Fenbendazole have shown potential in cancer treatment and may have positive effects on cellular carcinoma. However, it’s uncertain if these two drugs alone would be sufficient for your uncle’s case. The effectiveness of these treatments can vary significantly and depends on several factors, including the stage of the cancer, your uncle’s overall health, blood counts, immune system status, and his responsiveness to the treatment, among others.
Is it normal for your urine to have an extremely pungent odor from taking Fenbendazole? Or is it from the milk thistle or turmeric?
Hello Kimberly,
Fenbendazole, milk thistle, and turmeric typically do not cause changes in the odor of urine. While turmeric might alter the color of urine to a more yellowish or orange hue due to its curcumin content, it usually does not significantly affect the smell. Similarly, milk thistle is not known to change urine odor, and there are no well-documented cases of fenbendazole causing such a side effect either.
The causes of strong-smelling urine are often linked to factors like dehydration, specific dietary habits, certain medications, or medical conditions.
To mitigate strong urine odor, increasing water intake can help dilute the urine and reduce its concentration and smell. Additionally, if the change in odor is accompanied by other symptoms such as pain, discomfort, changes in urine color, or frequency, it could be indicative of an infection or another health issue. In such cases, consulting with a healthcare provider is recommended.
Is there any studies on the treatment of Marburg viruses with phenbendasol
Dear Jo,
As of now, there are no scientific studies or clinical research that indicate Fenbendazole, has any efficacy in treating Marburg virus infections or any other viral infections, including those caused by other hemorrhagic fever viruses.
Research on Marburg virus has focused on antiviral drugs, immune therapies, and vaccines. Some experimental treatments have shown promise in laboratory settings and animal models, but none have involved Fenbendazole.
Sirs,
My wife Valerie we diagnosed with breast cancer two months ago finding a dime sized growth. She had the growth removed, and deemed cancer free. Meanwhile until now Fat Necrosis set in and doctors did a follow up on her breast checking with biopsy on Fat Necrosis and found cancer has returned. Will this fenbendazole help control the reoccurring cancer cells? Any advice would be appreciated. Thank you.
Norman Ploscik
Hello Norman,
Numerous scientific studies and articles indicate that Fenbendazole has the potential to kill cancer cells, including the most aggressive forms of breast cancer. However, it is impossible to predict how your wife’s body will respond to the treatment due to various influencing factors.
Treating secondary or recurrent cancer is always a big challenge. Nonetheless, substantial evidence suggests that Fenbendazole can be beneficial even in severe cases.
If your wife chooses to use Fenbendazole, we recommend regularly checking her blood tests and liver enzyme levels, as well as monitoring her overall well-being.
You might find the following case reports relevant and informative:
https://www.fenbendazole.org/case-report-metastatic-breast-cancer-83-female-2/
https://www.fenbendazole.org/triple-negative-breast-cancer/
Fenbendazole save if I have liver cancer and cirrhosis
Dear Alfonso,
Fenbendazole is generally well tolerated and considered safe. However, if you have liver cancer and cirrhosis, there are important considerations. Liver cancer and cirrhosis significantly affect liver function, and since the liver is crucial for the metabolism of many drugs, impaired liver function may alter the metabolism of fenbendazole, potentially leading to increased toxicity or decreased efficacy.
The side effects of fenbendazole in humans, particularly those with impaired liver function, are not well documented. Possible side effects may include gastrointestinal disturbances, liver toxicity, or other unexpected reactions.
Therefore, if you decide to use fenbendazole, it is essential to check liver enzymes before starting treatment and regularly throughout the treatment. Regular blood tests and monitoring of general well-being are necessary to ensure the treatment is progressing smoothly and to identify any side effects early.
Is it safe if on Kacyla and other medications? (MONOCLONAL AnTIBODIES WITH SOME CHEMO ATTACHED?
Hello Dee,
While fenbendazole is generally safe and well-tolerated, it should be used cautiously with other medications, especially complex cancer treatments like Kadcyla, to avoid potential liver toxicity; avoid using fenbendazole two days before, during, and two days after chemotherapy, and monitor liver function regularly with blood tests.
Why would a person calcium be higher during this treatment?
Dear Susan,
It is important to note that not all patients will experience elevated blood calcium levels during treatment with fenbendazole. However, hypercalcemia can occur for several reasons, including the cancer itself or interactions with other treatments and supplements.
Cancer-related hypercalcemia can happen because some cancers, such as metastatic melanoma, produce substances that mimic parathyroid hormone (PTH), leading to increased calcium release from bones and higher calcium levels in the blood. Additionally, if the cancer has spread to the bones, bone breakdown can release calcium into the bloodstream.
Regarding fenbendazole, the death of cancer cells can temporarily increase calcium release from these dying cells, contributing to higher calcium levels.
I have stage 4 colorectal cancer. Tumors in my colon, on my lower spine, and multiple tumors in my liver. Largest being 13cm. I’ve been taking 222mg a day for a few days now. Should I b nervous about taking this with my liver tumors?
Hello Zachary,
Although fenbendazole is generally considered safe and has shown promise in scientific reports and preliminary studies for cancer treatment, it is metabolized in the liver. If you have liver tumors or impaired liver function, the metabolism of the drug might be affected, potentially increasing side effects or decreasing effectiveness. This is rare, but it is important to monitor your general health and regularly check liver function through blood tests. This helps detect any early signs of liver damage and allows for timely intervention if necessary.
It is important to note that if your liver enzyme levels do not rise above the normal limits by 2-3 times, there is generally no cause for concern, and you can continue the protocol. Additionally, we recommend adding Milk Thistle to your regimen as it can help support liver function.
Doesfenbendazole interfere with the chemo drugs gemcitabine and abraxane
Hello Clare,
Currently, there is limited clinical data on the interactions between fenbendazole and chemotherapy drugs, including gemcitabine and Abraxane.
Theoretically, there could be interactions due to overlapping mechanisms and liver metabolism. Given these uncertainties, it is crucial to proceed with caution. To minimize potential risks, it is generally recommended to stop taking fenbendazole two days before, during, and two days after your chemotherapy sessions. This precaution helps to reduce the potential for adverse interactions and allows your body to handle the chemotherapy more effectively.
Additionally, we recommend closely monitoring your health and conducting regular blood tests to check liver function and overall health if you decide to use fenbendazole alongside your chemotherapy regimen.
I ordered 222mg Fenben Lab,of fenbendazole for man 4th stage bileduct cancer,2 weeks to live.Is this suitable for humans or just research,?
Hello Linda,
Yes, FenBenLab is a reliable supplier, and its products are suitable for human consumption. Many people use their fenbendazole and achieve very good results. The quality of FenBenLab products is high, with their fenbendazole being 99% pure without any additives. This ensures that you are getting a pure and effective substance.
Additionally, FenBenLab offers convenient dosage options with capsules available in 222 mg or 444 mg. This makes it easier to adhere to the correct dosage and maintain consistency in your treatment.